For any developers listening out there......
1) Appealing Character designs. Not TOO realistic but not TOO cartoony either.
2) Smooth animation. Unfortunately for whatever reason, This usually causes the games to glitch but it's worth sitting through when it doesn't.
3) Easy interface. I play plenty of non-erotic games and don't need a massive one that takes as much time as a MMORPG, At the same time I do like some variety in gameplay but I don't want to be solving a billion puzzles just to move on with the story
4) Replay value. Namely alternate paths that make going through it again worth it.
5) Frequent updates. And not just saying it's updated and not like a lot of new games uploaded do
6) Decent soundtrack. Honestly, Most are pretty awful but occasionally they will find a nice groove
7) Many save spots. I play multiple games at one time and I like the option of jumping in any time when I feel the need to play it
8) Good storyline. I don't want to read through a novel like a lot of games on the site these days but at the very least there shouldn't be any Engrish, typos, or grammatical errors.
9) Decent dialogue. Sexy but not too porny.
I think most would agree on these yet it's so difficult to find any games that fit 1 or 2 of this criteria let alone half.